Footnotes

• Correction notice This article has been corrected since it published Online First. The title has been corrected.

• Contributors BC wrote the initial draft, which was then revised and edited by JM and JL.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests None declared.

• Patient consent for publication Not required.

• Provenance and peer review Commissioned; externally peer reviewed.